钍基先进核能系统的发展对核数据提出了新的需求。钍铀循环关键核素的多群数据库是堆芯物理设计与分析计算的基础。因此, 基于权威核数据处理程序NJOY对ENDF/B-VII.1评价核数据库进行处理得到WIMS格式多群截面数据, 利用专用更新处理程序WILLIE得到WIMS格式数据库, 并利用多群堆芯计算程序WIMSD-5B对数据库进行了一系列临界基准检验, 结果表明: 基于ENDF/B-VII.1加工的WIMS库与“WIMS库更新计划”(WLUP) 的网站上发布的最新版本WIMS库的计算结果基本一致, 并且, 在16个钍铀循环基准题检验中, 新加工的WIMS库计算平均误差要比WIMSD5B程序的自带WIMS库的计算结果小0.225 3%, 精度更高, 可靠性更好。

The development of advanced thorium-based nuclear system raises new requirements on nuclear data. The multi-group data file of critical nuclides in the thorium-uranium recycle is the foundation of physical design, analysis and calculation of the reactor core. Based on authoritative nuclear data processing code NJOY, this paper obtains a WIMS format multi-group cross section data files through processing the ENDF/B-VII.1 evaluation nuclear data file, uses the specific update maintenance procedure WILLIE to get a WIMS format data file, and conducts a series of critical benchmarks on the data file using the multi-group reactor core calculation code WIMSD5B. The results show that the computed results of the WIMS file based on the processing of ENDF/B-VII.1 are basically the same as those of the latest WIMS-D file published on the websites of the “WIMS-D” library updating project (WLUP) with higher accuracy and reliability than those of the shipped WIMS-D file of the WIMSD5B code. Furthermore, the average deviation of the new WIMS file performing in the validation of 16 thorium-uranium cycle benchmarks is 0.225 3% smaller than that of the old WIMS file.